Treatment of rubber and products obtained thereby



Patented Jan. 7, 1930 UNITED STATES PATENT oF'FicE JOHN HCGAVACK, OF JACKSON HEIGHTS, NEW

yonm'assrenoa ro ran nauoa'rucx CHEMICAL COMPANY, OF NAUGATUCK, CONNECTICUT, CORPORATION OF CON- NECTICUT.

No Drawing.

' poses made of rubber and fabric, tubular articles such as hose, footwear articles, andmany other types of rubber goods. It is of,

greatest importance in such cases to provide a combination which will permit of repeated flexing without rupture or separation ofthe rubber and fabric, since once this has occurred the useful life of the articles in most cases soon ceases. a

Until recently there has been no satisfactory method known for improving the capacity of a rubber compound to withstand such action without separation from the fabric, except to use a highpercentage of rubber in the compound, thereby considerably increasing the cost. It is known however, that fa ric treated with rubber latex and subseuently coated with rubber have an-increased exing life. j

One of the objects of this invention is to prepare an improved flexing compound which when compared-with ordinary carcass.

stock, upon flexing shows. a considerably in creased flexing value. Another object is to improve the present market grade of crude rubber and particularly to bring spray dried rubber up to a point when it is as good or betterthan smoked sheet or other market grades from the standpoint of flexing.

It has been'found that such objects can be attained when derivatives of thymol, namely thymoequinone, nitroso thymols,=amino thymols and similar bodies, or when alpha or beta naphthoquinone, are added to the ordinary flexing compound; These materials may be used singly or mixed as deslred The particular advantage. of-using materials of TBEATMENT OF RUBIBEB'AND IRODO'CTS OBTAINED THEREBY Application filed' September 20, 1928. Serial No. 307,339.

this type isthat they are non-explosive and can be readily molded or. incorporated intothe rubber in small amounts to provide greatly improved flexing values. This means that ,these materials are suitable ones to mix in carcass stocks for the manufacture of tires,

belting, etc., which material must stand severe flexing; particularly they are suitable for plied rubber stocks where whale or latexsprayed rubber are used. The following ex amples illustrate the invention:

Emample 1 P t Whale rubber (spray dried rubber) 1 00 Sulphur a 3.75 Zinc oxide 5 Mineral oil 5 Thymo quinonenul 1 Heptaldehyde aniline condensation product .5

This compound flexes about 300% better than thesame compound in the absence of thymoquinone. v

. Ewample2 Parts Whale rubber 100 f Sulphur 3.75 Zinc oxide 5 Mineral oil a Y 5 Heptaldehyde aniline condensation product .5 Nitroso thymol. .5 to 1 Such a compound flexes about 200% better than the same compound in the absence of nitroso thymoL.

Example? Parts' Whale rubber 100 Sulphur 3.75 'Zinc oxide 5 Mineral il o 5 Heptaldehyde aniline condensation Amino thymol .5

This compound flexes about 100% better than the same compound without. the amino thym This compound flexes about 125% better than the same compound without beta naphthoquinone.

Ewample Part: Smoked sheet 100 Zinc oxide 5 Mineral oil 5 Sulphur 3.75 1 Heptaldehyde aniline condensation product .Q. .50 Thymoquinone .20

The invention is capable of wide use in the manufacture of all rubber articles where good flexing is desirable, and it is of particular value for use with the usual vulcanized articles of commerce which are built up of layers. of fabric and rubber, such as tires, belting, hose, etc. It imparts to all-solidscontent-latex rubbers, that is spray-dried rubbers, flexing characteristics comparable with or superior to those of pale crepe,smoked sheet, etc., while at the same time retainin the valuable propertiessof quick cure, hig tensile strength, etc., which are characteristic of the all-solids-content-latex-rubbers. The flex-impartin materials may be incorporated into the latex efore it is dried, if desired. In the usual-course of manufacture, a fabric and rubber article will ordinarily be built up and then vulcanized, but in certain cases such as waterproof clothing, the rubberized fabric is sometimes first vulcanized and then made into the desired article or it may be partially vulcanized, made into the article and vulcanization then completed. In some cases the flex-impartin material may be applied directly to the abric or other form of fibrous material, as by ainting, subsequently'diffusing into the ru ber associated therewith in the construction of the article.

While in the examples given, certain vu1- canizing ingredients are disclosed, the invention is not to be limited to these and it may be carriedout by the use of any other suitable material. Also with the detailed disclosure above given it is obvious that modifications will suggest themselves and it is not desired to limit the invention otherwise than as set forth in the appended claims.

Having thus described my invention, what I claim and desire to protect by Letters Patent is:

1. The method of increasing the flexing value of a vulcanizable rubber compound,

und with a material se ected from the folowin up,-thymo-quinone, nitroso thymol, Em ia thymol, alpha naphthoquinone, beta naphthoquinone,and vu canizing.

2. The method of making rubber articles of high flexi capacity, which comprises associating rub r with a derivative of thymol, and vulcanizing.

3. The method of making rubber articles of high flexing capacity, whidi comprises associating solid rubber with thymo-qumone, and vulcanizing.

4. A vulcanized product of a mixture of a vulcanizable rubber compound and a material selected from the following oup, thymouinone, nitroso thymol, ammo thymol, alp a naphthoquinone and beta naphthoquinone.

5. A rubber compound containing a derivative of thymol.

- 6. A product consisting of a mixture of a vulcanizable rubber compound and thymoquinone.

7. A rubber stock containing thymoquinone.

8. A rubber stock containing a derivative of thymol.

9. A fabric rubber stock containing thymoquinone.

Si ed at Passaic, county of Passaic, State of vew Jersey, this 17' day of September, 1928.

JOHN 'MCGAVACK. 

